Maver Coat of Arms
According to Burke's General Armory, the Maver arms are "Argent, three bars voided sable, over all a lion rampant gules. Crest - On a rock, and eagle standing proper." This translates as a red lion on top of six black bars (in three sets of two) all on a silver shield. The crest, the part that would go on top of the knite's helmet, is an eagle perched on a rock which should be illustrated using an eagles natural colors. My own representation of this (without the crest) is shown on the right.
Who gets to use these arms?
As far as I can tell, no one is currently allowed to use these arms. The Scottish heraldic laws are very strict and they treat arms as a material possession; that is, they can only be owned and used by one person at a time. This means that it would be illegal for anyone to use these arms without proof that they are the rightful heir to these arms. I am currently in the process of figuring out who the rightful owner of these arms is.