You can set the Slider to display any static picture you want! <strike>(Maybe I should try a GIF next time :O)</strike>
Here’s How-
Step 1: Create a new post
Step 2: Use the image you want on the slider as it’s “Featured Image” (bottom right corner of Add New Post)
Step 3: Make a New Category for these posts (e.g “Slide Images”) and place all your New Posts (with Featured Images) in your New Category.
Step 4: From your Dashboard, go to Appearance > Theme Options > Image Slider
Step 5: Select your New Category for the option “Select Image Slider Category”.
That should be it. ??
Dimensions aren’t going to be a huge problem. I use 920×350 for mine. I suggest trying that first and adjusting accordingly.
Let me know if I missed something!