There are many interesting design ideas for decks. There is a variety of impressive new materials and products to choose from. Low maintenance decking is available in dozens of different colors, textures, and profiles. Use your imagination to insert a decking inlay pattern or border around your deck using different colors. What would your deck look like using diagonal decking? Railings are available in many styles from metal to glass to cable to vinyl. Consider using built in benches, planters, arbors, pergolas, or even an outdoor kitchen area.
Multiple levels are very popular and attractive. You can break up a boring large deck into unique dynamic spaces for different uses. Install an overhead shade canopy using decorative fluted columns or install glowing solar light posts. You might want to incorporate a hot tub into your design or create a water tight screen room out of the area below the deck. Your imagination and your checkbook may be the only limits to your options.
Browsing photos and researching materials can set you in the right direction. You might also consider a drive around your neighborhood scoping out some local trends.