A tweak (for iOS 7) that allows you to respring your device by swiping the homescreen card up in the app switcher.

SimpleRespring.xm

#import <substrate.h>

%hook SBAppSliderController

- (BOOL)sliderScroller:(id)scrollingViewController isIndexRemovable:(unsigned int)index
{	
	return YES;
}

- (void)sliderScroller:(id)scrollingViewController itemWantsToBeRemoved:(unsigned int)index
{
	// if it's the homescreen, respring
	if (index == 0)
		system("killall -9 SpringBoard");
	else
		%orig;
}
	
%end