Userscripts.org

Several customizable options. Special support for Userscripts.org (new interface, fix for pre tags, and allows you to hide the install warning box and footer) Changes text fields, buttons, links, selects, and text areas.

Set every form input to use a dark background and a light text colour.

Changes the color scheme for the site metalist.co.il, so that you don't have to poke your eyes out when done browsing the site.

In Travian this script enables BBCode in your letters and in the Forum.

Blue theme for YouTube. Changes nearly everything to blue... even the icon. Several customizable options just like in Web Styler. Check the screenshot.

Watch online videos without any distractions like ads, chats, comments, etc.. Options: Auto browser resize, video scale, custom background color, comments on/off, related videos on/off, download videos, +70 video sites. Updated June 17th

Changes google skin to blue background and white fonts. On mouse over links get marked. Flatten Buttons. Add's Local-, English Wikipedia Button. Add's Quote + Clear Searchfield Button. Limit search by Date, Remove Google Ads.

This script simply changes the background color

Google light blue skin. changes the background color, on mouse over links change color, different text colors, best with the google preview add-on for firefox. Made using Bloody_Angel's black google skin.

Highlight alternate rows on reddit.com

Replaces the Facebook logo and colour scheme to those of Northumbria University.

Changes the bright orange color of Userscripts.org to a different color.

Let's you click on a colorless code listing and highlight its syntax, with a little bit of luck. Works with CSS, XHTML, JavaScript, MySQL, and PHP. Easy to customize and expand supported languages. Based on Chili, which is based on jQuery.

Some Web 2.0 websites use light gray text on a white background which is not very readable. This script increases the contrast of texts on hard to read websites.

Distinct colors for normal and visited links

Changes blue color to white

Make Youtube not so eye-searingly bloomin' white

Changes the color of quoted levels (>, >> etc) of an email viewed in Yahoo! Mail.

Unset the color on visited links so I can tell I've visited them

Adds colour bands to rgb tagged colorfield photos

This deletes background images on web pages

makes the background black and the text white, either in an alternate stylesheet you can select as needed, or immediately

Puts all text in the default size

simplify design of The Onion pages

makes Something Awful pages blacker and with simpler design

simplify design of the McSweeney's site

simplify design of Bruce Sterling's blog, with larger fonts and white-on-black

simplify design of Counterpunch pages

makes Guardian pages blacker and with simpler design

Changes the color for visited links in Slashdot's "Lite" mode from black to violet