These... these are all pretty awful. So I'm gonna try and give you some advice.
- I can tell you animated this one after shrinking the sprites, because Slayer jitters like half of a pixel each loop. Line the sprites up, then shrink them together. It's the only way you'll get smooth animation. Also, this background is just... never use gradients for a background. Just don't do this. The text is unimaginative, and the font choice is completely random.
Regarding everything in this post - for the most part the fonts don't suit the image, and the effects you've applied to them either don't fit the text, or make it blend too hard into the background, making the text largely unreadable. The three at the top are the closest to being good.
Hexanoid's current avatar is fine, except for the gradient on the text (bevel/emboss?). Get rid of that and it'd probably look better.