Commands
/bc help - gets information on BlendChat commands
/bc set [player] <color(s)> - sets gradient colors for player
/bc copy <from-player> [to-player] - copies colors from another player
/bc reset [player] - resets gradient colors for player
/bc reload - reloads the BlendChat configuration file

Example Commands
/bc set #ff0000 #ffffff #0000ff - sets your own gradient to red, white, and blue
/bc set Steve &d &a - sets Steve's gradient to magenta and lime green
/bc set * &4 - sets your own gradient to your previously used first color and dark red
/bc copy Alex - copies Alex's gradient to your gradient
/bc copy Alex Steve - copies Alex's gradient to Steve's gradient
/bc reset - resets your own gradient
/bc reset Steve - resets Steve's gradient

Permissions
blendchat.* - grants all permissions
blendchat.self - user can change their own gradient (only needed if required-perms is enabled in the config)
blendchat.others - user can change the gradients of others
blendchat.copy - user can copy gradients from other players
blendchat.reload - user can reload BlendChat's config file

Other Resources
Hex Color Picker
Minecraft Color Codes