This day i see many good, but very small snow crystals, 1-2 mm. They don't melt, and i shoot them in short series. This picture was made from 8 serial shots, aligned and averaged to boost signal-to-noise ratio. Glass background with backlight, additional lens Helios 44M-5, december 2012, Moscow. Looks better in original resolution: 1200 x 900 pixels.
If you want to see more snowflakes, you can browse through all snowflake pictures.
Here you'll find snowflake photo wallpapers in numerous resolutions and screen proportions, up to Ultra HD 4K.
And here is article about snowflake macro photography.