I want to mod my gear!

I want to mod my gear. I've already made my keyboard. Black with red gothic letters. Now i want to mod my MX510(i wanna make it red with a cross blinking as a bit of heart). I know how to do that. I have problem with pad modding. I have 4D Steelpad. It's black. I wanna make a portrait of my G on it. But i don't know how to do that without losing gliding propetries? Gimme a tip!