When I first started juicing I tossed whatever I had in the fridge in my juicer and was never very impressed with my green juice (which was sometimes brown). As I became more experienced and began to try various recipes it was like magic, the right blends created green juice that was delicious! Here are a few articles with some recipes and tips to help you kick up your juicing routine.
Drink your vegetables Start your year with delicious green smoothies by Adam Ried
Are You Making These Common Juicing Mistakes? by Food Babe
Five Ways To Make Homemade Juice Taste Amazing by Katie Jones