4" x 2" white shipping labels. Avery 5163. Downloaded a template from the internet, then changed it majorly. Having access to a high end colour laserjet printer helps. Design is kind of like a business card with sections to put in frame description, matte descriptors and notes. I print off about 10 pages at a time, and fill in the final details by hand.
As you recognize...the finishing touch. Therefore, I am <u>not</u> a fan of producing my own labels. You will find a number of framers on this forum who will tout this technique, and I grant that it has economics and flexibility.
However, if you're looking for a premium label that puts "the frosting on the cake", go no further than The Stephen Fossler Company in Crystal Lake, Illinois...
I am subjected to three local label sales representatives a year. They will all have samples for you to look at and should help you (sort of) design one. Try the Yellow Pages, there should be a bunch of them to call.
If you have a logo, I would suggest you incorporate it, somehow, into your label if you can.
But a label knocked off from your ink jet printer just won’t have the same quality and professional look that a foil label will have, IMHO.