I saw a very similar idea to this when Googling and just had to have a go for myself, especially as its been ages since I have made any peg fridge magnets.
Nothing fancy …. I just used my 100 year old Dymo label maker to print the days of the week because I love the retro effect of the lettering and that’s really it! I do have tapes in lots of other colours, but I was being lazy, and didn’t relish the thought of doing all the feeding through for a one off idea …. but the pegs would look good in green, yellow, red, blue etc. And to make things even simpler the tape is exactly the same width as the peg … so no fiddly trimming.
On the reverse of the peg I have stuck a strip on adhesive magnet tape. Done and dusted!