I have a sheet cake I need to score next weekend that will have a simple flower on each piece and wondered if any of you had any tips on how to do it. Thanks!
The easiest way I have found is to use dental floss and a ruler!!!! 
Say you have a 12X18 and need 2 inch pieces. Measure all 4 in 2 sides in 2 inch lengths, marking slightly at edge (before border is added) and take a long piece of dental floss and hold it on one side and match it to the mark on the other side. Straight every time!!!!! Then when done, add your borders!!!! HTH and hope that made sense! 
I use to use dental floss also. But if your BC is crusted it doesnt work to well. I use a yard stick (ruler) to measure the size of the pieces and toothpick to score on sides. Then took to a ruler and a pizza cutter to score the pieces. Just another option, if the floss doesnt work for you!
I worked at a large bakery and they liked to score the iciing with a long knife. They like me to put just a light line on it. It was not too difficult. I think I like the dental floss idea though. I never tried that before. I'll have to try it. Thanks for the idea!!!
I took a piece of paper the size of the cake and folded it into as many even slices as I wanted. Then I poked a hole in the middle of each folded square of paper (a few layers at a time). I unfolded the paper and layed it over the crusted frosting on the cake. I took a toothpick and made a mark in the frosting in each hole. I put one flower on each mark. The cake wasn't "scored" but having the flowers even like that really forced the cutter to cut the cake evenly centering each flower.
Thanks for all the great tips! I don't know which to try first!
I just purchased a impression mat specifically for that purpose. 12x18 = 36 pcs, 10x15 = 25 pcs, 12x12 = 24, pcs & 6x6 = 6 pcs. It's called "K & S Quik-Press Cake Divider" I got it a local craft store that sells cake decorating supplies. I haven't tried it yet but it looks like it will work very well. 
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