Thanks for the tip.
What I actually had in mind was not setting the words in a constant colour or set background. My idea was more to help in the recognition of letters since from the early years, especially in our schools, children are taught their letters in a certain format - using comic sans type font. I just thought that in this way the children will be able to recogise the letters when exposed to them in a school setting.
This approach is used in all the schools here. This is done to also help the children in their handwriting and the formation of letters.
Besides, working with children with learning difficulties I have found that using this font helps them more in their reading since the letters are seen in the actual format they are written.