Would you like to know how to make a flower press? A simple one can be made using 2 end pieces with a stack of corrugated cardboard pieces in between, held together by 2 small cinch-type luggage straps. The end pieces should be ventilated... They can be as simple as 2 metal oven racks or as "elaborate" as rows of spaced-apart wooden slats whose ends are glued and nailed to 2 cross-wise slats. (If you make wooden ends, you could also apply pressure with wing-nutted bolts threaded through holes drilled in each corner - though that leaves a little less room for the flowers.) 

Include sheets of absorbent paper - the flowers/leaves should be pressed between 2 of these, in between the cardboard pieces. (The cardboard and the paper also help with the all-important ventilation.)