We just released over 10 different banners that our affiliates can use to promote eMiniMalls and refer publishers. Check out the sample 180×150 banner: 
The following banner units are also available:
180×160
120×90
120×60
120×240
125×125
110×32
88×31
80×15
468×60
Please login to your account and click on the “Referral Program” link to access the customized code for your referral banners.
Update:
- Added a few more formats. Specifically, 729×90, 300×250, 250×250, 120×600, 160×600 and 160×160.
- The background is now transparent and so can be used on non-white website backgrounds.