My seven yo DD would love to recieve any of the following:
£10 Build a bear voucher
Hello Kitty jewellery (Claire's access)
Next do some lovely "party" type tops for around the £8-10 mark and these always look good for the price - I often give them as birthday pressies...girls are getting into their clothes a bit at this age.
Anything crafty...
Hair accessories (H&M is good for this stuff).
A girls cookbook
Primark and M&S do some great budget wrapping and cards, I always stock up when I go in