All the Mondrian, abstract inspired watchfaces I've seen are digital so I made an analog one. 
Shows the day, date, battery level (line under hands) and Bluetooth connection status (outer border)
The watch buzzes when connected or disconnected. 
A fun hourly animation.
When the watch is shaken , the face shows the temp, battery level in % and steps taken.

An elegant and classy watchface that shows the day, date, battery level (2 bars up top),  Bluetooth connection status (the bottom rectangle is solid for connected and dotted for disconnected and the watch vibrates either way) and a classy hourly animation

A minimal, classy face that changes with a flick of the wrist. 
Still shows the day, date, battery level and Bluetooth connection though. 
Looks elegant on the Steel.

The famous MR Armchair by Ludwig Miles van der Rohe, designed in 1927.
Simple and shows all necessary info (battery, temp, Bluetooth, date) in a Bauhaus font

The iconic, abstract "Grey Circle"  by Wassily Kandinsky. 
Shows the day, date, temp, Bluetooth connection and battery level. 
Geometric hourly animations and fun Bauhaus fonts all around!

"UPWARD" abstract painting  by Wassily Kandinsky. 
Shows the battery level, temp, Bluetooth connection, day and date. 
Numbers and text are rendered in a Bauhaus font. 
Hourly animation and vibration.

An Art Nouveau inspired watchface. 
Shake it for a surprise.

A double watchface inspired by reversible watches. One face is inspired by the Omega lamagique and the other one is inspired by the Echo/Neutra Rivanera.  
Features:
1. Shake the watch and the face changes. 
2. Hourly animations and vibrations. 
3. Battery indicator. 
4. Bluetooth connection indicator.
5. Date and day of the week.
6. The Echo face changes from black to white depending on the time of day.

A classy Cartier Tank inspired watchface. 
Shows the date, day, battery and temp (in Celsius and Fahrenheit based on location)
The watch does a little dance hourly

An art deco inspired watchface. 
Info displayed: Bluetooth connection status, temp in Celsius, day of the week, battery level and date. 
The watch vibrates hourly with a 5 second animation

Ancient Egypt inspired watchface. 
Info displayed:
1. day of the week, dd/mm and temp in Celsius (always avoids the hands). 
2. The right obelisk represents the watch's battery level and the left one represents the phone's. 
3. The hour symbols animate on the hour for 5 seconds. 
4. The pyramids outline represents the Bluetooth connection status (solid for connected, faded for disconnected and the watch vibrates either way)

Islamic patterns watchface in English. 
Features:
1. White watchface for daytime and a black one for nighttime. 
2. Outer frame works as a battery level indicator. 
3. Shows, day of the week, date, temp (in Fahrenheit), Bluetooth connection status (the watch vibrates when connected/disconnected)

Arabic watchface inspired by Islamic Geometry. 
White watchface for daytime, black one for nighttime. 
Info displayed: day of the week, date, temp in Celsius, Bluetooth connection status. 
The watch vibrates when it's connected/disconnected

Ornate Arabic Tank watchface.
Features:
1. The watchface is displayed in white to represent daytime and it inverts after sunset to represent nighttime. 
2. The outer rectangle indicates the battery level and updated in real time. 
3. Bluetooth icon to represent connectivity status. Watch vibrates when connected/disconnected. 
4. Temperature is shown in Celsius. 
5. Date info (day of the week/dd/mm).
6. All info inside the inner rectangle always avoid overlapping with the hands. 
7. Super light on the battery.

True to heritage watchface.
Features:
1. The watchface is displayed in white to represent daytime and it inverts after sunset to represent nighttime. 
2. The outer rectangle indicates the battery level and updated in real time. 
3. Bluetooth icon to represent connectivity status. Watch vibrates when connected/disconnected. 
4. Temperature is shown in Celsius. 
5. Date info (day of the week/dd/mm).
6. All info inside the inner rectangle always avoid overlapping with the hands. 
7. Super light on the battery.