Irfanview is a free program, quite snappy, not demanding great resources. And safe.
Making icons of your own take some effort. You might find something in
http://community.us.playstation.com/t5/PSP-Media/Making-Icons-Using-IrFanView/td-p/11150354
or
http://www.sticksite.com/irfanview/
or directly in
http://www.irfanview.com/
You need to make the picture, though. It all requires some work, but where there is a will, there is a way. It will be rewarding, I trust. But be sure to have anything you do saved properly on at least one other place than your C. And if you use ready pictures, do be careful with possible user rights = copyrights, since they are a sensitive matter.