Reading a cool piece from a mathematics professor... this applys generally to limit holdem, basically to increase your deception at the table, he suggests that the colour of the cards could be used to tell you how to play for example
if he is going to play a hand, he will use the right card as his indicator, if its red, he plays it aggressively, if its black he plays it slowly... ok so thats preflop
on the flop he uses the middle card as his indicator, if its red he plays the flop aggressively, black passively..
ok the turn same thing.. red aggressive, black passive..
i found it to be a pretty cool system to add deception to your game.. he also went on and said the the suit of the card could tell you in what style to play.. red heart- loose aggressive red diamond-tight aggressive.. black club-loose passive and the spade- tight passive..
but you can make whatever system up you want, but a really good idea.
of course there are times where you would want to deviate from this system, but nonetheless a good idea..