You can create your own buttons and timers outside of Eko Studio then upload them to the Library.

Image Button

Screen Shot 2015-07-21 at 2.37.08 PMYou can upload an image (in a supported format) to Eko Studio and then drag it from the Library onto the button. From there you can adjust the transform settings of the button as you wish.

Button/Timer Skin Style

Edit an existing Style Skin, or code your own from scratch in Raccoon, then upload it to Eko Studio.
In Eko Studio you can adjust the element itself and edit its settings in the Style tab Options.