I often use premade labels, the kind you buy at the quilt store by the yard. They usually come with several different designs. I tend to use these mostly for smaller projects and stuff I give away. I also will make extra blocks and use one of those as a label. I typically will make one block where I've made a mistake, and those get turned into labels or I use them to practice machine quilt designs to see what I will like with the quilt. I also make my own labels using muslin or whatever fabric I have on hand. I haven't done much printing of my own labels, simply because I am saving all my photocopy fabric to make my in-laws a special memory quilt using pictures from their past.
If the quilt has a name, I always put that first. I put down who the quilt was made for, my name, the city and state where I made the quilt (I've moved a lot so this is important), and obviously the date. Depending on the quilt I will also add a poem or bible verse or some other inspirational saying. I may also add the reason I made the quilt or the inspiration behind it, though I tend to be long winded and that makes for a very long label! :lol:
Many times I will tuck a few squares of fabric I used in the quilt under the label. This is the emergency repair stash. If for some reason the quilt is torn or someone's cat walks across it and tears an area, I can often repair it by undoing a bit of the label, pulling out the appropriate fabric, and restitching the label down. The reason I hide the fabric is that as the quilt is washed, these extra fabrics will wash and fade at the same rate as the quilt top so that when I do use one as a patch the colors don't look different. You can do the same thing by using the fabric to make the sleeve, though that means you often have to repair the sleeve if you need the fabric and I find it's just easier to resew the label. I don't always do this with every quilt, usually just the big ones that are special or aren't going to charity. Hope this helps.
~Tiffany