Thanks KurtI will check out morguefile.
If I recall correctly the wording at istock was very ambiguous, but I printed it out for both their regular and extended license and it was my deduction (which obviously could be wrong) that they did not allow screensavers. I think I came to this conclusion from reading the extended license which did mention and allow screensavers whereas the regular license sort of avoided the subject. I could have come to the wrong conclusion. They did say to contact them if there were questions. Also I was looking a couple of months ago.
Regardless, I will be checking morguefile.