They are about 4 (girl) and nearly 2 (boy) I think. My budget is a maximum of £30 for the 2 of them. I have literally no idea what they are interested in, and I don't really know their parents, so can't ask them for advice. FWIW, it's a sort of secret santa for kids, at a colleague of DH's child-friendly christmas party.
So can you please give me ideas for generic presents for kids of their age that would be accepted quite happily by any parents? I would like to avoid messy stuff as I think that I wouldn't be happy with that myself. I just don't know what kids are into at the moment, despite having a toddler girl myself.