We know that Google Adsense provide some preset banners to showcase on websites or blog for promotions thru their AdWords program. There preset banners are of size like 728 x 90, 468 x 60, 336 x 280 and so on. If you want to create a banner for your own product or services to promote it on your own blog / website or other blogs then go ahead and create it online within 5 minutes.
BannerFans is a free online service to create banners of different sizes. They have provided some preset sizes which are nothing but the sizes mentioned in Google AdWords. To create a banner with preset, you just need to select the preset size, for example 336 x 280 from the drop down list. Now you can customize the banner with content or an image from your computer. They have also provided the option for selecting gradient mode to banners. Below are some of the options provided on BannerFans:
Go ahead and start creating banner for own blog or website. If you are planning to start an affiliate program for one of your products then go ahead and create banners with different sizes and let the publisher use those banners.