You should consider to work together with Jcome (Yu Chen) who is working on may aspects of the user interface, included the new theme icons:
github.com/synfig/synfig/commit … 94f485cbb0 plus.google.com/+YuChen/posts/4WYDJm964bp
Also worth reading this:
[image]
[size=150]Our goals[/size]
0, Issues we want to address
1, Interactive devices’ spec
2, Our target user or audience
[list]
i, Synfig: character animation & animated graphic design
ii, User Scenarios
[/list:u]
[size=150]Window System[/size]
0, Canvas Window
1, Layer Window
2, Parameters, Timetrack, Graphs Window
[list]
i, Parameter (Value) Widgets
ii, Parameter Filters
[list]
Early Discussion
Categorizing Params
[/list:u]
3, Tool Options Window
i, Tool Options Window …
We are very respectful with keeping the author of the works so probably if we take your designs would ask you for the license of your artwork.