Hey fellow PS3 gamers, I've recently just got into the whole PS3 theme maker thing.
I've got 2 themes so far, one is fully made from scratch (excluding icons) with a background I made. The other one is an edit of a popular Theme named "Aniom" by the user known as Nanoshock of deviantART.
So, first comes my own theme.
It's called Carbon R, because I'm heavily influenced by Gran Turismo 5 right now.
>>CARBON R THEME DOWNLOAD<<
And here's a preview.
Very simple I know. But hey, sometime simple is better.

(ALL RIGHTS RESERVED TO FRIEDRYCE (PSN) and RYUU (FFF)
And here is the edit of "Aniom" Theme.
If you have this theme, you'll notice that not much has been changed, except for the background, and the "TV" is also the same icon as "VIDEO"
>>ANIOM CUSTOM EDIT DOWNLOAD<<

(ALL RIGHT RESERVED TO THE ORIGINAL OWNER, NANOSHOCK.)
---- THEME INSTALLATION ----
If you wanna use those themes, then here's how you do it, via USB.
---USB---
• 1. Download a theme
• 2. Go into your USB and make a PS3 folder (must be all CAPS)
• 2.1 Make a THEME folder inside (must be all CAPS)
• 2.2 Drag/Copy the P3T file into THEME
• 3. Go to your PS3 XMB (console)
• 3.1 Go to SYSTEM on your PS3
• 3.2 Go to your THEMES
• 3.3 From the THEMES, on the top of the theme selector, there should be "install"
• 3.4 Select your USB drive
• 3.5 Select your theme and voila.
It should be the same process for PSP --to--> PS3