Here's an app made by myself and Puppy/Porteus forum member Geoffrey to change the clock (digital only) font and color. Menu entry is in Settings and it requires yad.

Right click > save link as
http://carolina-linux.com/rg66/porteus/ ... le-1.0.xzm
http://carolina-linux.com/rg66/porteus/ ... 0.26.1.xzm