Photoelectrochemical regenerative cells having at least one element, comprise: (a) a photoanode consisting of a layer of large band gap (&gt; 2,7 V) semiconductor (1) modified by an ultra-thin layer of a dye (chromophore) absorbing a large fraction of visible light, on a substrate (2); (b) a cathode consisting of a second substrate (3); (c) an electrolyte medium (4) containing a redox mediator, between the electrodes; (d) a sealing structure (5); and (e) two electrical contacts (6). At least one of the substrates is transparent to visible light and the photoanode is applied in any two-dimensional pattern, creating a colour contrast to the areas where the photoanode is not applied, in order to provide a personalised photovoltaic cell.    USE -   The cells are useful as stand-alone power sources which can carry an additional advertisement, decoration or any other display function for personalised purposes. The pattern can be geometric, figurative and/or alpha-numeric. The cells can be used for supplying electric power, e.g. to personalised greeting cards playing an appropriate melody, to personalised desk or wall clocks, watches where the solar cell can represent fully or partly the watch's face, pocket calculators or flash lights.    ADVANTAGE -    The method provides indelible and absolutely scratch-proof patterns on cells which can be manufactured at low cost, in contrast to standard single crystal, polycrystalline or amorphous silicon photovoltaic cells. Preparation of photoregenerative cells is relatively simple and both the active layer and the electrolyte layer can be applied using screen or roller printing, spray painting or dispersion stamping (claimed). The photovoltaic cells can be used for outdoor and indoor applications. In addition, the active layer can be coloured with, e.g. purple, blue, green, yellow or red using appropriate chromophores; and the chemical nature of the redox mediator can be tuned to display different colours. Under illumination with 100 Lux (60 W incandescant lamp) the cells can generate, e.g. 34 A (17 A/cm2), open circuit voltage of 535 mV (in examples).