In Zürich the Swiss have been usîng electronic strips in the tower and approach departure environment since about 1992 or 93.
Paper strips are still used in Geneva in coloured holders.
Generally the accepted world wide standard is Blue for departures and Yellow for Arrivals in the approach tower environment.
(although for some strange reason
Geneva does it the other way around - must be the only place in the world. As Zürich used to use the accepted standard - typical French speaking Vs SwissGerman speaking Swiss I guess - the rest of switzerland does it correctly)
The use of other colours is down to local preferences.
Hope you find a SAFE system which works for your particular airport.