I like to go with a few simple ingredients. Assuming up to 1.050 starting gravity, something like 90% base malt, 8% C40, and 2% black patent. That's it, unless I sub about 8% of the base malt for torrified wheat.
Wyermann make Sinamar too - a little goes a long wayYup. I shamefully used some red food coloring in an Irish Red once. Looked great!