A few months back I saw a picture online, I have a head like a crabbing net so can't remember where unfortunately, of some home made bath paints and thought I'd come back to it at some point and have a go myself but as I couldn't find it but liked the idea, today we winged it and made our own.
We took some silicone cake cases, some soapy foam (we had a few cans of Noddy foamy soap left over from Christmas but I'd have had a go with shaving foam had we not had that), food colouring - at last a purpose for those left over half used bottles and a couple of paint brushes from the craft cupboard.
We put a squirt of foam in each case then mixed a few drops of colour into each.
The colours came out great, very vibrant and fun. Little Mr was keen to be chief tester so he jumped in the bath with his paintbrush while I set up the cases along the side of the bath and then he was free to be artistic without any worry of lasting mess.