I like using colors when it comes to memory -_-
Can you expand on that? Isn't that just a more basic form of visualisation which is what derren (and others) suggest? Don't you run out of colours for huge amounts of information or are you saying you have synthesia?
synthesia :-D
Yes and yes to the initial questions... the colors are honestly tactile [touch] and even redolent [smell] to me. Hearing a word stimulates a color in my mind... hearing musical chords and notes stimulates a color(s). I believe all of this contributes to my memory. Expanding further on the video, I also tend to group things... perhaps to subconsciously and more easily organize a memory set. Not group like a story, but group in other arbitrary ways.
Best (or worst, depending on temperament) way to improve memory is by learning a musical instrument.