Pack of 4 Make Your Own Photo Baubles (pack includes 2 Star Shaped & 2 Round) £1.99 @ B&M in-store (not available on-line).
Each Bauble Holds 2 photos and there's a template included.
Although there are no measurements on the pack for the baubles I've just measured them and the size is (VERY) approximately as follows:
Round - 2.75 inches/7cms diameter.
Star - Measurement from tip to tip across the top 2 points approx 3.5 inches/9cms.
Also found when I opened them they are hinged at the top under the gold hanging bit.
Just for price comparison - was in Home Bargains a few weeks ago and they were selling a similar set for £2.99 at that time and Boots are selling the similar shot2go set for £8 or 3 for 2.