Gemfile

@@ -33,4 +33,5 @@ group :development do
   gem 'web-console'
 end
 
-gem "solid_queue", "~> 1.0"
+gem 'chroma'
+gem 'solid_queue', '~> 1.0'

Gemfile.lock

@@ -84,6 +84,7 @@ GEM
     bootsnap (1.18.4)
       msgpack (~> 1.2)
     builder (3.3.0)
+    chroma (0.2.0)
     coderay (1.1.3)
     concurrent-ruby (1.3.4)
     connection_pool (2.4.1)
@@ -326,6 +327,7 @@ PLATFORMS
 
 DEPENDENCIES
   bootsnap
+  chroma
   csv
   debug
   factory_bot_rails

app/models/group.rb

@@ -16,6 +16,8 @@ class Group < ApplicationRecord
   private
 
   def set_color
-    self.color = "##{SecureRandom.hex(3)}"
+    new_color = "##{SecureRandom.hex(3)}".paint
+    new_color = new_color.lighten(30) if new_color.dark?
+    self.color = new_color
   end
 end