Looking for SPRITE Specialist and excellent with RESPONSIVE websites

I have an HTML website that uses SSI (server side include) The problem is I have too many individual images. What i need is someone who is familiar with SSI and Sprites. I have 12 images total that need to converted into a single sprite. A combination of SVG and PNGs. Once you combine all the images, the layout MUST remain the same. All you are replacing is the images BUT using sprite technique. - End result: Must look good across all screens just like the original website. Mobile/tablet/desktop