Ravelry: Bright Textures Blanket pattern by Bernat Design Studio. I've done 2 afghans with this Bernat pattern (one as a scrap afghan, the other to match a decor) and both turned out beautifully. I would highly recommend this pattern.
If youre ready to give crochet a try, weve got you covered. Weve found 18 easy crochet stitches you can use for any project to get you started. Once youve learned a few basic stitches, you can tackle any simple crochet projects with ease. - Crafting Now
Start with 3 colors. Each block is 9 stitches so for however wide you want the blanket, count in 9 to get your foundation (always make it an uneven number of "blocks) eg: 19 blocks(makes it about long) stitches then add 4 sc for the foundation row.