we created an own color-palette and theme and uploaded that to our server. So far so good - now we try to use some of the sharepoint default images (like the big plus sign above lists for adding elements) inside of a custom visual webpart.
The question is: how do we get the location of the themed pngs? I tried this here but had to notice, that the bunch of numbers changes:
<span class="ms-list-addnew-imgSpan20"> <img class="ms-list-addnew-img20" id="idHomePageNewItem-img" src="<%: Web.ServerRelativeUrl + "_catalogs/theme/Themed/B33ABC55/spcommon-B35BB0A9.themedpng") %>?ctag=2"/> </span>