Yes, unfortunately there ARE limitations... for me it's usually the fact that the nicest colors are often very dark - and if light cannot pass through the glass - the color is locked inside.  So - how to thin the glass to allow the light...  

Over the years lampworkers have been able to work with glass from Italy, Germany, The Czewch Republic, China, Japan AND the US (to name a few)... that being said, we know that not all of the glass plays nicely together... so - how can we allow the colors to work off each other - but leave the glass in its purest form.  

Just this.  Separates.  Keep in mind also - that molten glass just naturally wants to be R.O.U.N.D  the tiles, Freefall and the Matchsticks are all hand shaped, painstakingly reshaped... 

Sometimes we are also looking for that in-between color... you know, maybe not quite amethyst, but not really lavender... so then the thinness of two colors is important when it comes to veiling or draping one over the other... to allow the light to flow through.

My eyes are always searching for the possibility of new shapes, then how to use them effectively in finished jewelry.  I could barely keep my hands off of the new Matchsticks up at the top and the great chunky tabs... seemed I worked with an end idea in mind, but I'll keep my idea under wraps until I see what YOU do!  smiles, Jill