My first idea is for a application that allows the computer to be navigated with gesture control, initial thought is to use the camera that is on almost every laptop to map the mouse pointer between say the thumb and the forefinger, and when the thumb and forefinger touch emulate a the click of the mouse. Further interface could also be implemented such as a virtual keyboard or talk to text features, basically attempting to replace a mouse and keyboard, further research needed.
My second idea is either a stand alone software or a Photoshop add on for real time pixel art animation editors. Given a sequence of images with a specified distance apart, color pallet and speed at which to move through the images, one could make a change and the animation would update real time, also allowing the change of color pallets.
My third idea is a personal budget planning and expense tracking app. I person can track what they buy by inputting the cost of an item and categorize that item falls into (possibly further subcategories for more in depth statistics) ie $16.69 on groceries on 1/21/19, $32.55 on cloths on 1/22/19 etc. One can input there salary and how much they want to not spend and the app could keep track and suggest a budget for you, give statistics about your spending patterns etc.