The key elements of good design are universal. Color, form, texture and scale are all important no matter what field of design you practice. And if you have an underlying concept to tie your composition together, that's the icing on the cake.
I love taking the principles I've learned in graphic design and applying them to the garden. Garden design, however, gives the added challenge of light, water and soil requirements. Getting all these elements in sync is like working a puzzle and continually moving the pieces around until you have just the right fit.