alternative to kidney beans?

because I'm still at school, I've been disguising half a tin of kidney beans each day by squashing them up and putting them between 2 pieces of wholewheat bread. This isn't very practical (or tasty), so does anyone know of any alternatives to kidney beans with roughly the same nutrition?
 
we like navy beans (northern beans) but I don't know beans about their nutritional value! hahahaha

all kidding aside,they may be like fruits & veggies - you may need to get a variety of colors for proper nutrition..........
 
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