Hi MummyMay and Christine,
Changing icons is a great way to personalize and even reinvigorate interest to your little ones towards Little Math. Many users have found this to be the case.
If you have not done so already, check out the Little Math Icon sets, most of which are free to download. There's many to choose from, so have a browse around and choose one which your child might like, if they don't like one, try another one.
Little Math Icon sets
http://forum.brillkids.com/downloads/?cat=221;pg=1;sortby=date;orderby=descAlso, there is no harm in taking a break, your child might have renewed interest later. It's still great that they are still enjoying reading!