hey madrid fan, i have just started setting up a crypto tank, i have used the following,
beckettii
undulata-broad leaves= background
wendtii-green
wendtii- brown
wendtii-tropica=these i have put at the front with some tennelus, i know they will grow quite tall but if need be i will replant at the back
crispatula var. balansae=tall thin leaves to surface like a reed
willisi-lucens=,middle
pontederiifolia =medium to tall background
i have also put in 2 specimens of lilly which complement it well.
the great thing about crypts is that you dont need that many when setting up they grow like hell popping up all over the tank! great value for money.
good luck also amanos online portfolio has some nice lloooking crypt tanks, albeit large but nonethe less inspiring, good luck.
http://www.aquaristics.com/ada-gallery.php http://www.adaeuro.com/gallery.asp