These are some options for image galleries. They use the JetPack plugin which is made by WordPress.
- Thumbnail Grid Gallery
- Square Tiles
- Tiled Mosaic Gallery
- Circle Photo Gallery
- Image Slide show
- Envira Gallery Plugin
However, these are by no means the only options. There are many more free and premium plugins to make WordPress image galleries look fancy.
Keep it simple is very good advice in this area. The more fancy you get the more chance you have of making work for yourself in teh regard of updates and maintenance.