just grab the parts you like throw them in photoshop and mirror, crop ect as needed. if your looking for logo type designs there is a lora that does logo graphics that might help out doing items and stuff on a plain background. might work for buttons and stuff too. Ui art is typically made using vector graphics styles because they easily scale with different resolutions and no pixilation, in many ways, its one of those things that is probably better to fully make in something like illustrator or flash or whatever people use nowdays for vector graphics.

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