If it's a contest, having SP make you one wouldn't be a good thing to do. It would be cheating, actually. Go find tutorials, get a good program (such as GIMP or PhotoShop), or yeah, ask someone to teach you. But don't cheat. Ever.

Only cheaters cheat.

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I still love Liah's sigs. Check them out.

{One big dysfunctional family}
This sig was made by Hyrule.