A simple watch with shows all the information your need.

A watch that shows the day kilometers/miles and calories done. The kilometers-miles and celsius - farenheit options are selected from mobile setup.
Displays some arches showing the percentage has been met daily and weekly target. The purple arc is the weekly percentage. The other can change color depending on the activity that is being done.
Exist an external arc to the sphere with the percentage of battery remaining.
Icon shows the time and the actual temperature.
And of course, the time and date.

Simple watchface analog and digital. it shows month day and week day, the battery charge and detects the connection lost from phone .

A simple circular watch with time in digital and analogic. 
The 12h indicator show the charge

Time, date, weather info (temperature, weather icon, sunrise hour, sunset hour) and battery power.
With advice when the watch is charging or lost the comunication with phone.

you could know the (approximate or rounded) time in a collection of five differents speech ballon.

Added support for Pebble time.
Time, day, weather and battery in the same screen with possibility to choose language and the update time (minutes or seconds).

Formula/equation on a blackboard. 
Under the root sign, are the hour and minutes. 
Below them a parenthesis enclosing the day of the month (numerator) the month number (denominator). 
Before that, two-letter week day. Up this, a number ranging from to 10 Indicates the remainig battery.

Pizarra de mates.
Hora y minutos bajo la raíz y separado por el signo de suma. 
Debajo, en el paréntesis, día y mes elevado a la batería restante ( de 0 a 10). Y precediendo al paréntesis, dos letras que indican el día de la semana.