I've started the process of redesigning the colours.

tcshrc.colors

@@ -80,6 +80,7 @@ set bright_white="$csi$ansi_bright;$ansi_white$ansi_color"
 # You process true colour by evaluating `__make_color_sequence` on the environment variable.
 alias __make_color_sequence ${CSHENV_DIR}/bin/__hex_to_ansi
 
+set sgr_reset="[`__build_sgr_code no-csi reset`m"
 
 ###########################
 # vim:filetype=tcsh

tcshrc.prompt.colors

@@ -3,15 +3,15 @@
 ######################
 
 
-set date_color="${dim_magenta}"
+set date_color="ansi:5"
-set time_color="${bright_magenta}"
+set time_color="ansi:13"
 set text_color="${bright_white}"
 set oldp_color="${dim}"
 set brace_color="${bright_yellow}"
 set host_color="${bright_blue}"
 set name_color="${bright_cyan}"
 set at_color="${dim_cyan}"
-set path_color="${bright_green}"
+set path_color="ansi:10"
 set line_color="${dim_red}"
 set prompt_color="${dim}"
 set depth_color="${dim_yellow}"
@@ -20,15 +20,12 @@ set command_color="${dim}"
 set color_start="%{"
 set color_end="%}"
 
-set date_color_seq="${color_start}${date_color}${color_end}"
-set time_color_seq="${color_start}${time_color}${color_end}"
 set text_color_seq="${color_start}${text_color}${color_end}"
 set oldp_color_seq="${color_start}${oldp_color}${color_end}"
 set brace_color_seq="${color_start}${brace_color}${color_end}"
 set host_color_seq="${color_start}${host_color}${color_end}"
 set name_color_seq="${color_start}${name_color}${color_end}"
 set at_color_seq="${color_start}${at_color}${color_end}"
-set path_color_seq="${color_start}${path_color}${color_end}"
 set line_color_seq="${color_start}${line_color}${color_end}"
 set prompt_color_seq="${color_start}${prompt_color}${color_end}"
 set depth_color_seq="${color_start}${depth_color}${color_end}"

tcshrc.prompt.defs

@@ -19,6 +19,7 @@ if( ! $?unknown_tty ) then
 endif
 
 
+
 # R G Y B C M
 set reference_colors=( ${csi}91m ${csi}92m ${csi}93m ${csi}38\;5\;33m ${csi}95m ${csi}96m )
 
@@ -112,9 +113,8 @@ set prompt_simple="${oldp_color_seq}[%n@%m: %c]%# "
 set align_prefix="%{${csi}A${csi}1000000G${csi}18D%}"
 set align_suffix="%{${csi}G${csi}1B%}"
 #set screen_return="%{8%}"
-set date_prompt_core="${date_color_seq}%{%Y-%W-%D %}${time_color_seq}%{%P%}"
+set date_prompt="%{%Y-%W-%D%}"
-set date_prompt_left="${date_prompt_core}"
+set time_prompt="%{%P%}"
-set date_prompt="${date_prompt_core}"
 #unset edit
 
 if( $?CSHENV_DEBUG ) then
@@ -128,7 +128,7 @@ set depth_prompt="${depth_color_seq}(${shlvl})"
 set line_prompt="${line_color_seq}`tty | sed -e 's;/dev/tty;;' -e 's;/dev/pts/;p/;' -e 's;/dev/;;' -e 's/not a tty/${unknown_tty}/'`"
 set user_prompt="${name_color_seq}%n"
 set host_prompt="${host_color_seq}${CSHENV_HOSTNAME}"
-set path_prompt="${path_color_seq}%c02"
+set path_prompt="%c02"
 set end_prompt="${prompt_color_seq}%#${command_color_seq} "
 
 alias oldp 'set prompt="$prompt_simple"; set cshenv_user_prompt_override'

tcshrc.prompt.final

@@ -1,6 +1,34 @@
 ############################
 ### Final Prompt Setting ###
 ############################
+
+# Recompute cached sgr codes from any configuration updates
+if( ! $?curr_path_color ) then
+    set curr_path_color=impossible
+endif
+if( ! $?curr_path_color || "${curr_path_color}" != "${path_color}" ) then
+    set curr_path_color="${path_color}"
+    set path_color_seq="[`__build_sgr_code no-csi reset ${curr_path_color}`m"
+endif
+
+if( ! $?curr_date_color ) then
+    set curr_date_color=impossible
+endif
+if( ! $?curr_date_color || "${curr_date_color}" != "${date_color}" ) then
+    set curr_date_color="${date_color}"
+    set date_color_seq="[`__build_sgr_code no-csi reset ${curr_date_color}`m"
+    set date_prompt_view="%{${date_color_seq}%}${date_prompt}%{${sgr_reset}%}"
+endif
+
+if( ! $?curr_time_color ) then
+    set curr_time_color=impossible
+endif
+if( ! $?curr_time_color || "${curr_time_color}" != "${time_color}" ) then
+    set curr_time_color="${time_color}"
+    set time_color_seq="[`__build_sgr_code no-csi reset ${curr_time_color}`m"
+    set time_prompt_view="%{${time_color_seq}%}${time_prompt}%{${sgr_reset}%}"
+endif
+
 if( ${prompt_hcolor} != 0 ) then
     set last_color = ${reference_colors[${prompt_hcolor}]}
 endif
@@ -18,6 +46,7 @@ set medium_battery_level   = 50
 set strong_battery_level   = 75
 
 
+
 while( ${prompt_hcolor} == 0 )
     if( $?CSHENV_DEBUG ) then
         echo colorshuffle
@@ -188,10 +217,10 @@ if( ! $?CSHENV_DISABLE_PROMPT_GIT ) then
     set git_prompt_view="${git_prompt}"
 endif
 if( ! $?CSHENV_DISABLE_PROMPT_PATH ) then
-    set path_prompt_view="${path_prompt}"
+    set path_prompt_view="%{${path_color_seq}%}${path_prompt}%{${sgr_reset}%}"
 endif
 
-set prompt_cool="%{\n%}${align_prefix}${battery_prefix}${battery_prompt}${date_prompt}${align_suffix}${brace_color_seq}\[${prompt_reference_view}${line_prompt_view}${depth_prompt_view}${line_spacer_view}${user_prompt_view}${at_view}${host_prompt_view}${git_prompt_view}${path_prompt_view}${brace_color_seq}\]${end_prompt}"
+set prompt_cool="%{\n%}${align_prefix}${battery_prefix}${battery_prompt}${date_prompt_view}%{ %}${time_prompt_view}${align_suffix}${brace_color_seq}\[${prompt_reference_view}${line_prompt_view}${depth_prompt_view}${line_spacer_view}${user_prompt_view}${at_view}${host_prompt_view}${git_prompt_view}${path_prompt_view}${brace_color_seq}\]${end_prompt}"