IR Remote

https://www.hackster.io/antiElectron/mood-lamp-with-ir-remote-control-a8207d

Traffic light

http://www.instructables.com/id/ATTiny85-Traffic-Light/

IR Alarm-irritator

http://www.instructables.com/id/The-IRritator/

Annoying beeper

http://www.instructables.com/id/Annoying-Beeper/

RGB-LED-WITH-DIGISPARK-ATTINY85

https://www.hackster.io/nekhil-ravi/rgb-led-with-digispark-attiny85-923259

Intervalometer

https://www.hackster.io/piotrjustyna/attiny85-powered-programmable-intervalometer-for-canon-dslr-337c11

RC RGB

https://www.hackster.io/achindra/controlling-rgb-with-digispark-953d3c

IR Decoder

https://www.hackster.io/ediy-team/digispark-infrared-receiver-8a2232

Ultrasonic LED distance sensor

https://www.14core.com/didispark-attiny85-with-ultrasonic-hc-sr04-sensor/

Weather station

https://arduino.stackexchange.com/questions/39229/attiny85-and-dht11-sensor-always-returning-0

Various games

http://webboggles.com/attiny85-game-kit-assembly-instructions/

Ultrasonic rangefinder alarm

http://www.instructables.com/id/Ultrasonic-Range-Finder-with-an-ATtiny85/