1.6 Can I print out a strip and make a t-shirt/mug/mousepad from it?

Yes, you have express permission to do this, but there are conditions:

*You can only do this for personal use. In other words, you can't sell them, even at a loss.
*You must keep all copyright notices intact, and they must be clearly readable.
*You are limited to six or less of each item.

This is essentially giving you a very limited license to use an image or group of images from User Friendly. The spirit of that license is to let you do what you want for personal enjoyment, but you need to acknowledge that the image(s) are our intellectual property.