For conditional formatting in SSRS you can use expressions like iif() and switch(). In my view though, you're better to keep logic like this in the data.
Say your SQL generates a column called SalesPerDay. You would also have a column in your data (let's call it SalesPerDayColour) that has the values, say "Red" for a certain range of sales and "Green" for the rest. Then in SSRS instead of selecting a colour for SalesPerDay field, select expression and select the SalesPerDayColour field. Note that your colours are case-sensitive so "red" does not equal "Red".
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