Want to be featured on ISO? Every week, we’ll announce a new theme. You’ll have until next Sunday to submit your photo as an entry. You may already have an existing photo that fits the theme, or you can take this as a challenge to shoot and upload a brand new photo.

Shadows can add dimension, depth, and drama to your images. Last week, we asked you to capture photos of striking shadows, and share them with us. We have received more than 500 entries—thanks to those who got creative and submitted their inspiring work! Scroll down to see 30 of the 500px team’s favorite shadows and silhouette images from the shadows gallery!

As always, we hold a random draw giveaway for all those who enter the contest. Anyone who enters will have the chance to win two months of Awesome membership! This week’s lucky random winner is Balázs Tör?. Congrats, Balázs, we’ve upgraded your account!

New theme for next week: NOSTALGIA
1. Select a photo that fits this theme. Upload the image, or pick a photo you’ve already uploaded.
2. Add the tag #500pxNostalgia
3. You’re done! Track all entries here.

Maybe you still have a photo of the very first concert you attended…

Or you kept your favorite childhood toy…

Or you want to share your first field trip…

Or want to do a tribute on how grandma dressed up back in the day…

Let’s turn back the hands of time. From portraits to landscapes, this theme is open to your own interpretation, so grab your gear, start shooting, and tagging now! Deadline is August 3rd at 11:59PM PT. Good luck, everyone!