Photosaic will allow you to upload not one, not two, but five images at a time and mux them together into a euphoric image square medley that will blow your mind. Go crazy with the different image styles to transform your mosaic into something amazing like different kinds of apples. This app usually retails for $1.99/£1.49 but you can pick it up today for only $0.99/£0.69. Download here.