I was looking for an article that could give me the recommended size if I had to create advertisements for my own website.
I found this useful to start with. Kindly explore and I did manage to try a few variations with a tool called Inkscape.
Credits : http://designerstoolbox.com/designresources/banners/
http://tim-stanley.com/post/standard-web-digital-image-sizes/
| Size | Style | Gif Weight | Flash Weight | |
| 468 x 60 | Full Banner | 20 KB | 30 KB | |
| 728 x 90 | Leaderboard | 25 KB | 35 KB | |
| 336 x 280 | Square | 25 KB | 35 KB | |
| 300 x 250 | Square | 25 KB | 35 KB |
Credits : http://designerstoolbox.com/designresources/banners/
http://tim-stanley.com/post/standard-web-digital-image-sizes/
