Okay then.
This is the code (remove the asterisks) :
[*table=width:715]
[tr]
[td][*IMG]http://oi58.tinypic.com/2ebyfli.jpg[/IMG][/td]
[td][*spoiler=Open Me :3][*FONT=Comic Sans MS][*COLOR="#0000FF"][*SIZE=2]I made the sig myself[/SIZE]
[*SIZE=1]Sprites were found [*URL="http://welcometoathena.tumblr.com/post/54852487291/animal-crossing-sprites-masterpost"] here[/URL][/SIZE][/COLOR][/FONT][/spoiler][/td]
[/tr][/table]
I removed the font tags for your spoiler. As far as I know, spoilers cannot be formatted on this forum. There was also a tiny problem with the table width tag. And finally, tinypic tends to not always work well with direct links. In this case, what you needed was
http://oi58.tinypic.com/2ebyfli.jpg instead of
http://i58.tinypic.com/2ebyfli.jpg
Also, for me "Open Me :3" is a bit too long for the spoiler text, so you might want to simply put "Click" instead but I don't know how it shows up on your computer.
Hope that helps!