Free Download Nokia 3500 Classic Themes
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I have been using mobile9.com since it stated in 2003 and have never had a problem. If you are downloading symbian or windows mobile applications (sis, sisx, exe) for your smart phone then I would be extra careful though. The reason being it is very hard to make a malicious file in java but for these other formats it is possible). If any malicious files were uploaded however they would be reported and removed quite quickly i would imagine.
To be on the safe side it is recommended you make regular back ups of your phone and only install applications that you trust.
I would imagine zedge to be the same but i hardly use it so cannot give any review.
Viruses don't exist for your phone so you don't need to worry about that - to get apps & themes for your phone look for them at sites that offer stuff for Symbian S40 phones such as mobile9 or getjar.