Here`s some links to lessons available on Guitartricks. These cover many aspects of improvising in many styles. Regardless of the style you wish to cover, the principles are the same so do not disregard a lesson because of the style but look at the principle presented and I`m sure you`ll be able to apply them to your own.

Nick Marchant as made a extensive 15 lessons tutorial on improvising in the spanish/gypsy style

http://www.guitartricks.com/lesson.php?input=9901&s_id=212

HPCRAZY has a 8 lessons tutorial on rock. His lesson #7 covers basic improv using the minor pentatonic scale. Full access member will enjoy the video where HPcrazy explains it all in depth.

http://www.guitartricks.com/lesson.php?input=9820&s_id=195

Another cool HPCRAZY lessons on improv is this one where he explains how to build a solo using themes and improv with licks.

http://www.guitartricks.com/lesson.php?input=9819

If you love theory then that a look at this Ben Lindholm lesson on improv.

http://www.guitartricks.com/lesson.php?input=9726

Doug Fearman tutorial "PLAYING OVER Amaj7-Gmaj7" as a very interesting lesson on improv

http://www.guitartricks.com/lesson.php?input=9261&s_id=153

The Ace as a 13 lesson tutorial on modes. In the last lesson, the ace gives us his way of applying modes to song creation. Not improv per say but still some information that you can use towards improv.

http://www.guitartricks.com/lesson.php?input=7382


Hope these links gives you some new ideas