Okay, I get how to make a banner, but can I have some リンク to apps on certain sites that make banners?

I use Polyvore. It's suppose to be about fashion and clothes but あなた can use letters and cool pictures, too. :)

Uh, I use photoshop. But if あなた don't have that then just use word または paint *shrugs* I don't go all professional on these banners, I just keep it simple ^^
Good luck with ur banner-making :)

I use GIMP now, but Picnik does make banners. あなた just go to the collage maker and pick either the setting of how many pictures あなた want and mess around with the ratio until あなた get it to look like a banner shape. Then click 次 when you're satisfied and then crop the 写真 to "800:100" and あなた should get a banner. It won't be fantastic, but it's a banner nonetheless. Hope that helped. :)