I have always had a colour/letter colour/number synesthesia - I believe I inhereted it from my mother. When trying to remember a word, I tend to remember only the colours... Therefore I have some trouble remembering new words, since for example R, S, and T are almost indentical shades of red. Same goes for I, J, C, O, whom all are light-gray-shiny-ish letters. Numbers on the other hand, I find much easier, since there only is ten different numbers! Haha
Also, when thinking about a name, there's usually a mental painting coming up in my mind - for example is the name Magnus red in the corners and the frame of the "picture", light neon green at the left side, a dot dark grey-purple in the middle and subtly light blue and orange at the right.