Here is a couple of designs i have done. One is "bitcoin 2009" and one is "to the moon".
https://www.cafepress.com/RedFiveSoftwareThe t-shirts are available in a number of styles.
And the mug has a logo designed by myself. A rocket going ... to the moon.
I can do the designs on other items if you want. It is your standard CafePress shop, so you can get it in anything from a mouse mat (is that still a thing?) to a tote bag. You can order from them quite safely, though I am not sure they accept bitcoin.
Let us know what you think.