drop shadows and gradients...
not the best thing for logos
rules of thumb for the visuals-
1) does is work in black and white? (no- not shades of gray)
2) does it read at 3/4 inch?
3) does it read on 10 foot banner that people see while driving by?

the concept is okay but the words will not read at 3/4 inch- so you will need to work on it a bit more.
There is a lot you can do with that roller that I don't see happening in your designs- have you tried a side view that will make it look like a "P"?
jlp