I made this one for my MIL's birthday last year. Sorry for the busy background. I chose cranberry with sage and yellow accents- a classic combination. The magnolias are the large focal point flower with smaller hydrangeas for variety and all those "fuzzy" stems for accent color and texture.
Here it is on top of the fridge.
And here is one in our bathroom. I wanted a green tonal look for this room as an accent to the navy, white, and slate blue in the rest of the room. The tall green "cone shaped" flowers are the focal point with the cat tails adding texture and the round flowers added a contrasting shape and another shade of green.
One last tip to save on cost is to use the premade "floral bunches" they sell in the store. You will need to cut everything apart when you get home so it doesn't look so fake, but use the bunches to your advantage. They can save you money and give you a dominant flower with several accent stems. In the first arrangement for my MIL, the magnolias and some of the fuzzy stems and grasses were purchased separately, but the hydrangeas, leaves, the fern like stems, and the pale greenish yellow clusters all came on the same bunch. I just cut it apart and mixed it together with the other stems.