No need to worry, for you can work around this problem using the W3C provided miracle that is inline styles.
Inline styles are CSS elements that are added to a standard HTML tag. There also easy enough to add to your posts...
So that something like this:
is done using the following HTML:
<FONT STYLE="color: red; font-family: 'New Century Schoolbook', serif; background: yellow; font-size: x-large">blue</FONT>
Et voila! That's all there is to it. You can find out more about which properties you can use here.