DropDead clothing has made some Sonic themed bonus items.
Here, you can see a mini poster, various stickers, an art card & a mini poster card. Each has branding for DropDead, Sonic, or both. The Sonic theme socks are shown here so you can help tell the size of the items. They feature their logo filled in with colorful pixelated Sonic scenes, classic character art, and some plain logos too. One of these items may appear with your order of the Sonic clothing line on this page. The top white item is the 'thank you for ordering' card. 

A special secret surprise prize?
Yes, it is! These little chaos Emeralds are a free bonus prize when you order from Drop Dead! Every clothing item will secretly come with 1 of these different chaos emeralds as a surprise. Notice how much attention they were paying to the actual emeralds from the games! They got the colors right, with both blue AND the aqua. (This is a lot more than even lots of toy companies can say)
This is a fantastic & thoughtful added touch! The quality here & level of nice-ness just keeps getting better with Drop Dead. Photo by: DropDead You can also see a Youtube Slipper review where the reviewer uncovers an emerald. Extra info added by All-StarWarriors

When you order from Drop Dead, your Sonic stuff gets the premium treatment! Just look at all this nifty themed packaging.
First off, you've got the box (square black), then some Sonic themed tissue paper that has line art for Sonic Tails Knuckles & Eggman 9 (in his egg o matic) along with the logo. Your item can also come inside this cool & re-use-able Sonic zip top big plastic bag. There is also an art card, stickers & even the paper tag is themed.
The tiny colored bits in the top photo are the 'blind bag' style Chaos Emeralds they also include as a surprise. (So, you can see the stuff is actually pretty big) 

• Owned by: All-Star Warriors Owned by: All-Star Warriors
• Owned by: All-Star Warriors Owned by: All-Star Warriors
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Now here is a feat of accomplishment that's a rare sight indeed!
It's all 7 of the Drop Dead Chaos Emeralds bonus items. It is very hard to get them all because they are both blind-packed (in those foil things you see there to the right) AND randomized - enclosed with whatever merchandise you ordered. No one had control over what you were going to get since it is mail offer items. Also, the items (as you can see from reading here) weren't inexpensive, which meant lots of buying & collecting (maybe people could trade too...if you knew someone else in the area) had to be done to aquire all 7 colors. However, here you can see it accomplished! And, they look great. The facets are pretty, the colors are accurate, they're a nice size...they're exactly what is cool as a bonus.