Originally Posted by harvey

3 options:
1) copy wp-signup.php to your theme and modify it as needed (best results, might be complicated if you don't know much about WP)
2) plugin: http://wpmututorials.com/plugins/sty...r-signup-page/
http://wordpress.org/extend/plugins/...dmin-branding/
3) by css: simply change style with css (but you'll need to re-upload the css every time you upgrade)

as for captcha, you can use http://www.642weather.com/weather/sc...ss-captcha.php for any form, including signup and login