We had to do this post, when we came across some nice blogs with good content but badly done header graphics, If you have some photoshop skills it could take a few minutes to make a goo header image for your blog an for the rest, here's a selection of online tools which can be used to generate free header image for your blog.

A professional header image in our opinion would have clean graphics and hopefully consist of stylized text. Here are our top choices :

#1 Xara3D Heading Maker : The widget below generates a 3D header for your blog, however we admit that choices are somewhat limited.

#2 Flaming Text : Lot's of styles and options, Do check this out.

#3 CoolText : This header logo is specially selected for ladies and female bloggers. Also has some cool fonts for use and download.