SIM cards are plain white on the front and back and contain no logo. If you want a logo on the card you can:
1. Use a sticker.
2. Use a stamp.
3. Get a card printer
that supports printing cards with chips.
Many have asked if your brand name will appear on the subscribers phone (carrier name in the left or right corner of the screen), the answer is no. The carriers do not offer this ability or feature to us, in fact only one MVNO in the U.S. (the largest one) has this feature so it's long proven not to be important to your success.