I'm a bit busy, but I could for you. Its really easy, to do, you know.
Simply resize them to 256x256(Pixels), and then package them as Prints_1x1_(Name here). Inside, you should have:
-An "Icons" folder (Put your icons in here, note that if you name an icon the same as a print, that icon will be assigned to that print.)
-A "Prints" folder (Put the print here. Name it well, something like "PortalPrint01")
-Description.txt
-(Just in case), a server.cs (Copy and paste from a default print folder.)
Making icons:
Simply resize them to 64x64 (Pixels) and then put them in the "Icons" folder, WITH THE SAME NAME AS THE PRINT YOU WANT IT ASSIGNED TO.
I guess that should help.