Discussion on:

Display meaningful graphics in Access reports

Nice idea to make things quicker / easier to read.
However, this is just a thought about the article: the expression you suggested will show the downward arrow for Q2 if sales are equal to those in Q1. Although it is perhaps not very likely, handling that situation would seem prudent to me. Many of us have ignored the possibility of something happening because it was 'so unlikely', only to find it occurring...

You can definitely handle the equal condition separately -- there are many possibilities!

Thanks for the idea, it helped me..