Any craft requires a perfect knowledge of colour combination to make it look awesome. That knowledge will not come in a da or two. you need to practise and test so many crafts to gain that knowleg\dge. Sure there will be many trials and errors but, with consistant testing you can learn that knowledge at last. However, there’s a speedy way to learn it with little to no trials and errors. Just copy other experienced crafters then after some time you will feel that you have that wisdom in your mind.
This is an incredible crochet project with perfect colour combination you could copy cat. tuts plus has shared the tutorial to how to make this crocheted lap rug. You can find the tutorial from HERE.