The colour of text used in the caption of the Browse Subcats area of a store should not be taken from the user defined store colours. It should follow the rest of the site and be fixed as white on the green background.
One fine day (if not already) someone will use green text in their store banner and that caption will be invisible. Certain colour choices already make it difficult to read.
Not picking on Kim here just using this to show where the problem is.