Designing Swag - Coffee Mugs

Over the past 18 months, I've been trying to come up with a way to fund my website. Redbubble.com came to mind. 

Right now I have a few offerings over there. As I design these things, I place an order to make sure the quality and value is there. So far, I've ordered a few mugs and some notebooks. I use the mugs everyday, but they are not without some flaws. 

The mugs retail at about $16.00 each, which I feel is a little high. When Redbubble runs sales or if you order more than one, the price comes down to about $12 or 14 bucks. 

One of the flaws is that the logo is not even on the cup. It's close but not quite centered. I'm looking to fix that but since I lost my files, I haven't been able to get the time and redo the image. 

Click here to see it on Redbubble. 

I also have the same mug in pure white. I'm not sure which one I like best. 

All links go to the Redbubble order page. Each mug holds 11 oz. (325 ml) and are 3.2" (8.2 cm) around, not including handle. They are dishwasher and microwave safe.